<template>
  <view v-if="goods_info.goods_name" class="goods-info-container">
    <!-- 轮播图区域 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" :circular="true"
      :indicator-color="'#ffff00'" :indicator-active-color="'#000000'" interval="2000">
      <swiper-item v-for="(item,i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>

    <!-- 信息区域 -->
    <view class="goods-info-box">
      <!-- 价格 -->
      <view class="price">¥{{goods_info.goods_price}}</view>
      <!-- 文本主体 -->
      <view class="goods-info-body">
        <!-- 名字 -->
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费 </view>
    </view>
    <!-- 多个详情图片 -->
    <rich-text :nodes="goods_info.goods_introduce"></rich-text>
    <!-- 商品详情页面，底部导航组件 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>

  </view>
</template>

<script>
  // 按需导入辅助方法
  import { mapState, mapMutations,mapGetters } from 'vuex'
  
  export default {
    computed:{
      ...mapState('m_cart',[]),
      // 把 m_cart 模块中名称为 total 的 getter 映射到当前页面中使用
      ...mapGetters('m_cart',['total']),
    },
    // 面首次加载完毕后，不会调用这个侦听器
    // watch:{
    //   // 1. 监听 total 值的变化，通过第一个形参得到变化后的新值
    //   total(newVal){
    //     // 2. 通过数组的 find() 方法，找到购物车按钮的配置对象
    //     const findResult = this.options.find(x => x.text === '购物车')
    //     if(findResult){
    //       // 3. 动态为购物车按钮的 info 属性赋值
    //       findResult.info = newVal
    //     }
    //   }
    // },
    // 定义 total 侦听器，指向一个配置对象
    watch:{
      total: {
        // handler 属性用来定义侦听器的 function 处理函数
        handler(newVal){
          const findResult = this.options.find(x => x.text === '购物车')
          if(findResult){
            findResult.info = newVal
          }
        },
        // immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
        immediate: true
      }
    },
    data() {
      return {
        // 商品详情信息数据
        goods_info: {},
        options: [{
          icon: 'shop',
          text: '店铺',
          // info: 2,
          // infoBackgroundColor: '#ff0000',
          // infoColor: "red"
        }, {
          icon: 'cart',
          text: '购物车',
          info: 0
        }],
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ],
      };
    },
    onLoad(options) {
      // 获取ID
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },
    
    methods: {
      ...mapMutations('m_cart',['addToCart']),
      // 获取商品详情的数据
      async getGoodsDetail(goods_id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        // 使用字符串的replace()方法，为img标签添加行内的style样式，解决图片底部空白间隙的问题；将webp后缀改为jpg后缀，.webp在ios上支持得不是很好
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display: block;" ')
          .replace(/webp/g, 'jpg')

        this.goods_info = res.message
      },
      // 预览轮播图
      preview(i) {
        uni.previewImage({
          // 预览时，默认显示图片的索引
          current: i,
          // 所有图片 url 地址的数组
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      //商品详情页，底部左侧导航的点击事件 
      onClick(e){
        // console.log(e)
        if(e.content.text === '购物车'){
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      // 底部右侧导航点击事件
      buttonClick(e){
        if(e.content.text === '加入购物车'){
          // 2. 组织一个商品的信息对象
          // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
          const goods = {
            goods_id: this.goods_info.goods_id,
            goods_name:this.goods_info.goods_name,
            goods_price:this.goods_info.goods_price,
            goods_count: 1,
            goods_small_logo: this.goods_info.goods_small_logo,
            goods_state: true //是否为选中状态
          }
          
          this.addToCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      font-size: 18px;
      color: #c00000;
      margin: 10px 0;

    }

    .goods-info-body {
      // border-top: 1px solid #DCDFE6;
      // border-bottom: 1px solid #DCDFE6;
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        margin-right: 10px;
      }

      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        border-left: 1px solid #DCDFE6;
        color: gray;
      }
    }

    .yf {
      font-size: 12px;
      color: gray;
      margin: 10px 0;
    }
  }

  .goods_nav {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
  }
  
.goods-info-container{
  padding-bottom: 50px;
}
</style>
